If you want to find an inexpensive engine, I would go with a 360 magnum from a truck/dakota. If you have a decent budget, I would go with Gen 3 Hemi and transmission. If you can buy a wreck in your country to transplant everything, that would save you quite a bit of money. A Gen 3 hemi will get you quite a bit of power for the buck plus mileage.

Welcome to the board. Please start a post with your build and post lots of pictures!